<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>图形绘制与圆角边框</title>
    <style>
      /* .sanjiao1 {
        width: 0;
        border-width: 100px;
        border-style: solid;
        border-color: red transparent transparent;
        border-radius: 50%;
      }
      .sanjiao2 {
        width: 0;
        border-width: 200px 100px;
        border-style: solid;
        border-color: red transparent transparent;
      }
      .sanjiao3 {
        width: 0;
        border-width: 200px 100px;
        border-style: solid;
        border-color: red red transparent transparent;
      } */
      .top {
        width: 100px;
        height: 50px;
        background-color: skyblue;
        margin-bottom: 50px;
        border-radius: 50px 50px 0 0;
      }
      .left {
        width: 50px;
        height: 100px;
        background-color: pink;
        border-radius: 50px 0 0 50px;
      }
      .center {
        height: 200px;
        width: 100px;
        background-color: skyblue;
        border-radius: 0 100px 100px 0;
      }
    </style>
  </head>
  <body>
    <!-- <div class="sanjiao1"></div>
    <div class="sanjiao2"></div>
    <div class="sanjiao3"></div> -->
    <!-- <div class="top"></div>
    <div class="left"></div> -->
    <div class="center"></div>
  </body>
</html>
